Pump or motor.



R. ULLMAN. PUMP OR MOTOR.

APPLICATION FILED I'EB.13, 1911.

1,029,157. Patented June 11,1912.

TTORNEY:

WTTED STATES PATENT ()FFICE.

RUDOLPH ULLMAN, OF OAK IPALRIK, ILLINOIS.

PUMP B MOTOR.

To all whom 'it may concern:

Be it known that I, RUDOLPH ULLMAN, a subject of the Emperor of Austria-Hum gary, residing at Oak Park, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Pumps or Motors, of which the following is a specification, reference being had to the accompanying drawings.

My invention relates to rotary pumps and motors, and has for its object to provide certain improvements by which the inlet and outlet sides of the apparatus will be effectually separated so as to prevent leakage, thereby conserving the power employed in operating the device. I accomplish this object as illustrated in the drawings and as hereinafter described.

hat I regard as new is set forth in the claims.

In the accompanying draWings,-Figure 1 is a vertical section; Fig. 2 is a central horizontal section; and Fig. 3 is a perspective view of one of the pistons.

My improved pump comprises two coacting substantially semi-cylindrical pistons arranged side by side'so that their paths overlap, said pistons being inclosed in a suitable casing having an inlet atone side and an outlet at the other. The pistons are mounted on parallel shafts which are geared together so as to rotate at the same speed, but in opposite directions, and provision is made for forming annular chambers within the casing in which the pistons move and fit closely. The inner walls of the piston chambers are formed principally by internallyprojecting annular flanges carried by the side-plates which form the casing or housing, and such flanges are cut away atappropriate points so as to provide a suflicient space for the passage of the pistons. The flanges fit closely against the pistons so as to prevent leakage.

Referring to the drawings,4=5 indicate the two semi-cylindrical pistons, which are rectangular in cross-section, as shown in Fig. 2, and are provided with hubs 6-7, respectively, connected therewith by narrow Web-plates 8-9. On the side opposite the pistons the hubs 6-7 are provided with short radial flanges 10-11, as shown in Figs. 2 and 3, said flanges being preferably continuations of the web-plates 8.

12-13 indicate the piston-chambers in which the pistons 4-5, respectively move,

Specification of Letters Patent.

Application filed. February 13, 1911.

preventing leakage.

Patented June 11, 1912.

Serial No. 608,298.

said chambers being formed by matched side plates 14-15 which are fixedly secured together outside of peripheral plates 16-17. Said peripheral plates are curved, as shown in Fig. 1, and extend through arcs of approximately 225 degrees, their end portions extending outward to provide outlet and inlet passages 18-19 at opposite sides of the machine.

20-21 indicates shafts which extend through the'casing concentrically with the piston-chambers and are provided with suitable stuffing-boxes 22. Said shafts carry gears 23-24, respectively, which intermesh, as shown in Fig. 2. The hubs 6-7 of the two pistons are keyed upon the shafts 20-21 so that they rotate in unison in opposite directions.

25-26 indicate annular flanges carried by the plate 141: and arranged concentrically with the shafts 20-21, respectively, and 27-28 indicate similar annular flanges carried by the plate 15 which also are concentric with the shafts 20-21. The flanges 25 and 27 lie opposite each other and fit closely against the web-plate 8 and flange 10, and the flanges 26 and 28 are opposite each other and fit closely against the web-plate 9 and flange 11, thus inclosing the hubs 6-7- and formingthe inner boundaries of the piston-chambers.

As shown in Fig. 1, the flanges 25-27 are cut away, as shown at- 29, and the flanges 26-28 are cut away as shown at 30, to afford space for the passage of the pistons and to provide extending bearing surfaces between the pistons and said flanges, thus This is an important feature of my invention, as by this means I avoid the objection common to prior pumps or motors of this type.

So far as I am aware, no one heretofore, in a device of this character employing two coacting rotary pistons, has provided an extended bearing surface at the meeting point of the two pistons, and consequently such prior devices have been subject to leakage at that point. By my construction I provide piston-chambers which are quite tight and in which the pistons fit closely so that I am able to conserve the power employed in operating the device. When the apparatus is used as a pump the shafts 20-21 are driven from any suitable source of power, the water or other fluid pumped being drawn in through the inlet 19 and discharged through the outlet 18. By forcing a fluid into the device through the inlet 19 the device may be used as a motor, the power derived being transmitted through either or both shafts 2021.

In the claims I have applied the term motor to the apparatus, but it will be understood that such term is used in a generic sense and is not intended to restrict the use to which the apparatus may be put, since it is intended to include pumps and any other use to which the apparatus may be put, whether it be as a motor or pump or for any other purpose.

That which I claim as my invention, and desire to secure by Letters Patent, is,

l. A rotary motor, comprising side plates spaced apart and secured together, said plates having internally-projecting annular flanges forming overlapping cylindrical piston-chambers, shafts extending through said side plates and arranged concentrically with said piston-chambers, substantially semi-cylindrical pistons moving in said pis tonchambers and having hubs mounted on said shafts, and inlet and outlet passages at .therewith to form the inner boundaries of the piston-chambers.

2. Arotary motor, comprising side plates spaced apart and secured together, said plates having internally-projecting annular flanges forming overlapping cylindrical piston-chambers, shafts extending through said side plates and arranged concentrically with said piston-chambers, substantially semi-cylindrical pistons moving in said piston-chambers and having hubs mounted on said shafts, and inlet and outlet passages at opposite sides of said piston-chambers, said pistons having flanges which project between said annular flanges and cooperate therewith to form the inner boundaries of'the piston-chambers, said annular flanges having extended bearing surfaces cooperating with the outer surfaces of the pistons.

RUDOLPH ULLMAN.

Witnesses:

JOHN L. JACKSON, MINNIE A. HUNTER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

